function circleArea(radius) {
    return Math.PI * radius * radius;
  }
  function circlePerimeter(radius) {
    return 2 * Math.PI * radius;
  }
  const radius = 3.14; 
  const area = circleArea(radius);
  const perimeter = circlePerimeter(radius);

  console.log(`圆的面积是: ${area}`);
  console.log(`圆的周长是: ${perimeter}`);